洱海富营养化评价及其影响因素分析

Eutrophication Evaluation and Analysis on Its Influencing Factors of Erhai Lake

为了解洱海富营养化状况,通过现场调研及资料收集,研究了洱海总氮(TN)、总磷(TP)、高锰酸盐指数(COD Mn)、透明度(SD)、叶绿素a(chla)与综合营养状态指数TLI(∑)的相关性及富营养化的影响因素。结果表明:①2008—2017年,洱海TP、TN、COD Mn、chla、TLI(∑)总体呈上升趋势,氮、磷是主要污染因子;②洱海chla、TN、TP、COD Mn与TLI(∑)呈显著正相关;③洱海综合营养状态指数呈上升趋势,富营养化有加重的趋势,必须采取针对性保护措施,遏制富营养化发展。

In order to examine the eutrophication status of Erhai Lake,through on-site investigation and data collection,the correlation between total nitrogen(TN),total phosphorus(TP),permanganate index(COD Mn),total transparency(SD),chlorophyll a(chla)and total nutrient state index(TLI)and the influencing factors of eutrophication in Erhai Lake were studied.The results showed that TP,TN,COD Mn,chla,TLI(∑)were increasing from 2008 to 2017.N and P were the main pollution factors.Chla,TN,TP,COD Mn were positively correlated with TLI(∑).The comprehensive nutritional state index of Erhai Lake was growing.The trend of eutrophication was getting worse.Therefore,countermeasures must be taken to curb the worse of eutrophication.